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Ferrite heat-resisting cast steel, preparation method thereof and applications thereof

A heat-resistant cast steel, ferrite technology, applied in mechanical equipment, engine components, machines/engines, etc., can solve the problems of small elongation, unstable mechanical properties, etc., to improve the structure, improve thermal fatigue performance and High temperature oxidation resistance, effect of purifying molten steel

Active Publication Date: 2014-05-28
CRRC QISHUYAN INSTITUTE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The content of chromium, aluminum and manganese in this cast steel material is relatively high, and a certain amount of vanadium is added, so the mechanical properties are not stable and the elongation rate is small

Method used

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  • Ferrite heat-resisting cast steel, preparation method thereof and applications thereof
  • Ferrite heat-resisting cast steel, preparation method thereof and applications thereof
  • Ferrite heat-resisting cast steel, preparation method thereof and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1）

[0049] The alloy components and mass percentages of the ferritic heat-resistant cast steel in this embodiment are C: 0.25%, Si: 0.91%, Mn: 0.43%, P: 0.023%, S: 0.078%, Cr: 14.55%, Ni: 1.15%, N: 0.027%, Re: 0.02%, Nb: 0.2%, Al: 0.01%, and the balance is iron and unavoidable impurities.

[0050] The preparation method of the ferritic heat-resistant cast steel of the present embodiment comprises the following specific steps:

[0051] A. Alloy melting.

[0052] According to the composition and content of the alloy, put the bottom slag into the furnace first, then put 0.35% recarburizer, 67.02% scrap steel, 1.02% nickel plate, 29.19% ferrochrome, and 0.33% ferroniobium into the furnace. After all the molten steel is melted, slag is removed and new slag is made. When the temperature of molten steel rises to 1540°C, 0.33% ferromanganese is added for pre-deoxidation. Iron sulfur, when the temperature of molten steel is higher than 1600 ℃, add 1.06% silicon-calcium deoxidizer for sec...

Embodiment 2）

[0061] The alloy components and mass percentages of the ferritic heat-resistant cast steel in this embodiment are C: 0.20%, Si: 1.2%, Mn: 0.45%, P: 0.022%, S: 0.10%, Cr: 15.0%, Ni: 1.10%, N: 0.034%, Re: 0.02%, Nb: 0.17%, Al: 0.07%, and the balance is iron and unavoidable impurities.

[0062] The preparation method of the ferritic heat-resistant cast steel of the present embodiment comprises the following specific steps:

[0063] A. Alloy melting.

[0064] According to the composition and content of the alloy, put the bottom slag into the furnace first, then put 66.08% steel scrap, 1.01% nickel plate, 29.41% ferrochromium, and 0.32% ferroniobium into the furnace, and wait until all of them are melted into molten steel Remove slag and create new slag. When the temperature of molten steel rises to 1540°C, add 0.49% ferromanganese for pre-deoxidation. When the temperature is higher than 1600°C, add 1.47% silicon-calcium deoxidizer for secondary deoxidation. It is a low-aluminum ...

Embodiment 3）

[0073] The alloy components and mass percentages of the ferritic heat-resistant cast steel in this embodiment are C: 0.16%, Si: 1.16%, Mn: 0.42%, P: 0.016%, S: 0.11%, Cr: 15.79%, Ni: 0.97%, N: 0.046%, Re: 0.05%, Nb: 0.3%, Al: 0.09%, and the balance is iron and unavoidable impurities.

[0074] The preparation method of the ferritic heat-resistant cast steel of the present embodiment comprises the following specific steps:

[0075] A. Alloy melting.

[0076] According to the composition and content of the alloy, the batching is carried out. Firstly, the bottom slag is loaded into the furnace, and then 54.16% of heat-resistant cast steel is returned to the furnace, 35.06% of scrap steel, 0.44% of nickel plate, 8.76% of metallic chromium, and 0.22% of ferroniobium are loaded into the furnace. In the furnace, after all molten steel is melted, slag is removed and new slag is made. When the temperature of molten steel rises to 1540°C, 0.21% ferromanganese is added for pre-deoxidatio...

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Abstract

The invention relates to ferrite heat-resisting cast steel and a preparation method thereof. The preparation method comprises following steps of: melting an alloy, tapping molten steel, casting and performing thermal processing. The alloy comprises following components by weight: 0.10-0.25% of C, 0.6-1.5% of Si. 0.2-0.6% of Mn, not more than 0.05% of P, 0.03-0.12% of S, 14.1-20% of Cr, 0.8-1.35% of Ni, 0.01-0.06% of N, 0.01-0.1% of Re, 0.15-3.0% of Nb and 0.01-0.8% of Al, with the balance being iron and unavoidable impurities. The ferrite heat-resisting cast steel has high high-temperarure oxidation resistance, high-temperature fatigue resistance and high room-temperature toughness, and is low in production cost and suitable for production of components of engine discharging systems.

Description

technical field [0001] The invention relates to a cast steel material and the production method and application of the cast steel, in particular to an exhaust system component used in the production of exhaust manifolds, volutes, connected volute exhaust manifolds and the like for automobile engines. Components are heat resistant ductile steel. Background technique [0002] With the increasingly stringent global requirements for energy conservation and emission reduction, automobile engines will face higher challenges in energy conservation and environmental protection, and need to meet stricter requirements. Exhaust system components, such as exhaust manifolds, are key components of automobile engines, and their quality directly affects the service life and emission performance of the engine. At present, in order to meet the energy-saving and emission-reduction requirements of automobiles, the exhaust gas temperature of the engines of domestic and foreign high-end automobi...

Claims

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Application Information

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IPC IPC(8): C22C38/60C22C38/48C22C33/06C21C7/04C21C7/06F01N13/08
CPCY02P10/20
Inventor 喻光远徐贵宝魏冬冬龚家林王思千张剑云白云
Owner CRRC QISHUYAN INSTITUTE CO LTD
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